Validating with login server

If it is a clustered, try connecting from Active node of SQL Server to the SQL Server Instance.If this works then it could be a firewall blocking connections from passive node and other clients.To confirm that firewall is blocking the connectivity, use Port Qry from Family ID=8355e537-1ea6-4569-aabb-f248f4bd91d0&displaylang=en Here is a sample output when I connect to a server name SQLMOSS (This should be a node name if it is a standalone instance and virtual server name if it is clustered instance) If you don't get any instance names returned in the result set, it should be firewall blocking the traffic.

Now the client will reconnect to SQLMOSS instance using the TCP port 1488 and provided there is not firewall blocking, this connection will succeed.You can get the port in which SQL Server is listening from SQL Server Errorlog.If you don't have permission to install/download Port Qry, try using telnet program available inbuilt in Windows (For Win from command prompt, I got a blank screen like below which indicates that SQL Server is listening to my request: If this step fails, contact your system administrator with this data so that he can check the firewall logs. If you get login failures, first thing to check is the default trace because default trace gives you the reason for login failure in plain english.It will be a good step to stop Firewall service and give it a try.If you are interested in adding Exception to firewall, add exception for Port 1434-UDP for SQL Browser and Port xxxx-TCP for SQL Server.

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